Data from: Biotic interactions help explain variation in elevational range limits of birds among Bornean mountains

These data estimate the occupancy of each bird species at each elevation on each of four mountains in Borneo. Species detected fewer than 10 times on a given mountain are excluded. This 'naive occupancy' value was estimated by dividing the number of points where the species was detected on a given mountain at a given elevation by the total number of points at that elevation. Points were lumped into elevational bins; see manuscript. Also includes estimates of the summed occupancy of potential competitors of the same genus and of the same foraging guild (these estimates are obtained as above).